21=2x+-13

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Solution for 21=2x+-13 equation: 



21=2x+-13

We move all terms to the left:

21-(2x+-13)=0

We add all the numbers together, and all the variables

-(2x-13)+21=0

We get rid of parentheses

-2x+13+21=0

We add all the numbers together, and all the variables

-2x+34=0

We move all terms containing x to the left, all other terms to the right

-2x=-34

x=-34/-2

x=+17

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